Hi Adam, may be worth getting doctor to check your iron and b12 levels (needs a blood test), lots of people with Crohn’s have low levels of either or both and can cause fatigue. If you have had surgery and can’t absorb b12 then you can get injections, spray or skin patches. Iron can be taken orally or if that upsets tummy by infusion (but make sure they supervise closely, I didn’t realise there was a small chance of severe reaction to iron infusion until it happened to me!). I also found that azathioprine made me increasingly fatigued and some other drugs have that effect on others.
I think that just having Crohn’s is also a bit knackering to be honest.
But I’d start with the blood test to rule in or out deficiencies that could be easy fix.
Good luck.
Just my two cents worth, years ago(almost twenty), I had severely low iron. The only reason given at that time..It may have been poor absorption?? It built back up, slowly, with "Slow FE" and vitamin C taken with it. Years later, thyroid problems(I was feeling tired); now taking generic, Levothyroxine. Years later, I felt super fatigue, I couldn't get enough rest and had no motivation to do anything. A blood test showed high Calcium levels which indicates an over-active Parathyroid. I got surgery and felt better the same day.(you have four Parathyroid glands, no problem to remove one) usually just enlarged. Scans don't always find it, but high blood calcium is an indicator. Forward about 10 years, I was diagnosed with Crohns in April 2019. I am currently taking Humira. My symptoms were not what I thought Crohns should be. I had various arthritis symptoms, including, "iritis" in my eyes several times over the last few years. No diarrhea, mostly constpation. A colonoscopy found the ulcer in the illeum. Feeling great, so far(three months on Humira).