Hi Hannah
Are you experiencing lack of appetite due to abdominal pain and cramping as well? I know when I had an abscess it was difficult for me to feel like eating anything. The smallest bits of food would upset my stomach and make me feel distended. Eating was not fun for me at all.
Once I found out I had an abscess and Crohn's I was put on a liquid diet for 2 weeks while I was in the hospital and they pumped me full of IV antibiotics. Are you on any medications?
I've found that as long as active inflammation is present, eating is difficult for me. Thankfully, I seem to be very close to remission and am not experiencing difficulty eating. I've actually gained more weight than I've ever been, which I'm not sure is entirely a good thing, haha.
So, if you aren't on any sort of medications, I would contact your GI or find one who can get you started on treatment to get your disease under control. If your current medications aren't helping, maybe it's time to get something stronger. Or if you haven't given new medications time to work, maybe your doc can give you something in the meantime to help with the pain until the other medicines have had a chance to kick in.
Otherwise, I would say that trying a liquid diet for a while (though it can be hard) would give your gut some rest and then slowly add low fiber foods back into your diet. These things should be easier to digest and will be easier on the gut if you do still have some active inflammation going on in there. You can find more info on the forum about low fiber/low residue diet, just search the threads. I was on this for about a year and I think it helped my healing tremendously.
If you haven't heard about protein replacement drinks like Boost or Ensure, you should look into those as long as you aren't following a dairy-free diet. It should help you get the calories and vitamins you need on a daily basis if you don't feel like eating.
Hope this helped some.