22 y.o. severely constipated

I used to have an eating disorder. It started when I was 18. I got treatment. Recovered. I've been eating disorder free for about 2 years now. I'm 22 now.
When I had the eating disorder I used to fast all the time and it'd be normal for me to be constipated. But now that I'm eating again and things are back to normal my bowel movements have not gone back to normal.

As of right now, it's been 2 weeks since my last bowel movement. I had one bowel movement in the last 2 weeks but it was seriously, barely anything.
This thing is killing me. I eat healthy foods. I'm 5"4 and 110 pounds now. My stress level is slightly high because I'm finishing college. But I'm not sedentary. I am conscious of fiber and eating fruits and veggies.
I don't know what else to try. I use laxatives as a last resort. But it's terribly painful. And I hate having this problem.

In the last few months I've gained 5 pounds. I've been very tired. And with the constipation and some other symptoms, I thought I had a hypothyroidism. But I went to the clinic and my TSH levels were ok.... and I'm running out of ideas as to why this is happening to me.

It's starting to affect my self esteem. I really am feeling terrible about myself and I will do anything to fix this. I'm desperate. Tweet