advice NEEDED please..

Hi everyone!

Here is my situation:

For the past few years I have been under eating. I had lost about 40 pounds through eating 1500 calories without eating exercise calories (before I knew you were supposed to). After I had lost some weight I decided to take it a step further in order to lose more weight and began eating 1200 calories regardless of exercise calories as well. Obviously this was not the way to go and I lost too much weight. This lasted for about 3 years.
After learning about MFP I changed my goal to eat my BMR + exercise calories. I have put on a little bit of weight (about 10 pounds). I am in a healthy weight range being at 130 pounds at 5'6". I am currently eating 2000 calories and not eating my exercise calories. I typically do about 4 days of cardio (30-60 min runs) and a little bit of strength training as well but not much after I injured myself. I have been eating 2000 calories for about 3 months thinking my metabolism would be fixed by now.
My weight fluctuates a lot and the scale shows I am slowly gaining weight. I was just wondering if anyone could give me some advice on where to go next. I would really like to lose about 5 more pounds. I obviously do not want to starve myself like I have done in the past. Have I completely ruined my metabolism? Any advice would be very much appreciated.

Thanks so much for reading.