I'm 43 and at first I thought it was early menopause also. When I talked to my Dr, he said that the exhaustion and hot flashes are symptoms of crohn's also. My periods are different also. I used to be around 4-5 days, but now, it's just bloody mucous the first day, then really heavy days 2 and 3, and then bloody mucous again for 4-7. I hate it because my crohns symptoms are SO much worse when I'm on and just before my period! I am even more miserable for that week and a half or so! I'm getting the crohns pain and the period pain, more D, and alot more physical exhaustion. It is so hard to get up and go to work during that time! I just want to call in sick for the week.
My gyno suggested endometrial ablation which basically burns the lining of the uterus and will completely stop the period or drop it down to just spotting for a couple days. The problem is that it does nothing for the hormones which I think is the main cause of the symptoms to begin with. Still looking into it though. A couple days (at the most) is better than 7!