Back problems - any ideas?

I'm in a bit of a difficult situation at the moment and really need some advice and motivation.

Last year, from January-July I was working out around 5-6 days a week, sometimes twice a day and felt really fit/strong as I was combining cardio workouts like walks and cross training with weights workouts. Everything was going well and although I wasn't losing as much weight as I wanted on the scale, it had started to move and I was feeling a lot better about my body and started to get compliments from others who keep fit.

I then had a horrible fall last July, partly caused by an ear infection which affected my balance and partly due to having a few drinks on an empty stomach after not drinking for several weeks (part of my healthy diet). It was scary as I spent 3 days in hospital but I am ok and very lucky, though I've been left with recurring back problems every since. I had an MRI at the time of the fall and nothing out of the ordinary was detected, though my back hurt at the time but I put it down to bruising and the fact I had fallen on my back.

After around 3-4 months the pain which had been constant started to subside but I was left with daily back paid in the middle left part of my back which seemed to get worse throughout the day although it was ok until mid-afternoon most days. I tried to improve my posture and use good chairs etc. which helped a little and I have had a healer come to my house for 3 sessions which I've found has helped a lot too, because I was getting pain going right up to my skull and neck but that's now completely gone. Generally I don't feel too bad now, though all it takes is for me to sleep in the wrong position or turn the wrong way and the pain gets worse again for a while.

I have tried to start training again a few times since the constant back pain stopped but each time I've had to give up again as the back paid has got much worse again the very next day. I have found that walking is generally ok and even very gentle jogging for short periods but anything involving movement of my upper body (even light weights on my arms) causes my back pain to re-start. I should try and do my legs, but it almost seems pointless if I can't work my other body parts.

A few days ago I tried to do some Pilates because my back had been ok for a couple of weeks but the very next day I leaned forward very slightly to pick something up and my lower back clicked and I was in agony, barely able to walk for about 3 days.

The guy who did the healing (a friend of a friend) told me that he can definitely feel something out of place in my lower back and also my upper back and he said that all it takes is a movement in the wrong direction and it can cause a nerve to be pushed out of place or a disk to move etc. After the experience last week with my lower back he is definitely right because it was the first time my lower back hurt.

I have never had any problems with my back before this and really want to get back into training because I've now regained all the weight I lost during the first part of last year (around 1 stone/ 14 pounds) before the fall and my body fat is higher than ever. I feel really horrible and my other half is really disappointed in me as he says that if it had happened to him he would have been really really careful with his diet but the problem for me is I seem to be eating a lot more than I was again and the wrong foods because I am not able to move so much, I am finding it really hard to get back into the 'health and fitness' frame of mind when I can't do any exercise other than walking.

If there's anyone who has been in my situation and had these kind of problems, what did you do to get back on track, back in shape and is there light at the end of the tunnel? I want to be back to how I was before and be able to do the training I want to again. It's so frustrating, especially as last year I was on track to reaching my goal weight but now I'm back to square one.

I am waiting for someone to give me the number of a Chiropractor they know but part of me is really unsure about that too because I've heard horror stories of them making it worse and at the moment it's fine again so it's not something which is there all the time.