Back pain after deadlifts

Hi all, I've been lifting for over a year now so deadlifts are not new to me. However, I'm struggling with adding weight to them. Every time I try, I get back pain (used to be lower back pain, but I think I figured that one out and don’t have that problem anymore). I haven't tried to increase my deadlift weight for some time and I've had absolutely no back pain (even the normal stuff I used to have – yay!!). So I thought I’d give it a shot. Almost 2 weeks ago, I added 10 pounds when doing a Romanian dl (I meant to grab the 2.5# plates and I added a 5# weight on each side instead...stupid mistake). Well, since then I've been experiencing a lot of pain in my back. I'm pretty sure it's not my spine. It runs across my back (not up and down) - mostly on the left side, but some on the right. It's just below the center of my back (not my lower back). It hurts when I twist or bend and even just sitting here it aches. It sometimes hurts to walk (especially the first week). And at times when I do something, I get a really sharp instant pain that will make it hurt worse than it did before that. So now I'm sitting here taking it easy waiting for it go away...(which sucks). It is getting a little better very very very slowly…. so I hope it will go away (just wish it went away faster).

I don't really know what the heck I did wrong - I try to have very good form, keeping an arch in my back, chest up, shoulders pulled back during the movement, etc. I've read a lot and watch a lot of videos to learn form, but I've never actually had the opportunity to have anyone watch me. I go to the gym in the early morning, and the one trainer who is available is usually busy training someone or leading a class. There is only one other woman I see in that area, but I’ve never seen her do a squat or a deadlift. I've never even seen a man doing squats or deadlifts and frankly, most of them seem more annoyed to see me in "their space" than friendly and approachable (although I think most are getting used to me). I know someone at the gym does squats at least because many times I have to unload their four 45-pound plates before I can do my workout (grrrrr - but that's another topic) – but they are there at night, not in the morning – so I’m kind of out of luck.

Anyway, I haven't gone to a chiropractor or for a massage or a doctor yet because frankly, I'm afraid of them bending or twisting me (especially the chiro). I'm not looking for medical advice on mfp. I'm only wondering if anyone has experienced this before and perhaps what I could be doing wrong in my lifts that would cause this to happen. I know that’s tough without a video or something, but I don’t have a smart phone to record myself and post it. But any general advice would be great!!