Just constantly run down and exhausted

I'm not sure what I'm looking for here besides some feeling that I'm not alone. I've had IBS-d (and ulcerative colitis) for as long as I remember. I'm fairly used to the stomach issues and cramps, constant trips to the bathroom, and sudden crisis situations.

What I'll never get used to is constantly feeling bloated and exhausted. I don't think my loved ones realize just how run down I'm always feeling. It gives me constant brain fog, and impacts my mood and general outlook.

It's such a part of who I am that I don't even know that it's abnormal. A couple of times a year, I'll wake up and feel AMAZING. Unbelievable energy, clarity, and general well-being. And I'll wonder at the fact that many people feel this way all the time!

It's like Flowers for Algernon, except I don't get smarter. For a brief period, I just don't feel shitty. And it's wonderful, except I know what's coming, and I almost wish I didn't know what it's like to feel fit for a day.

Has anyone else experienced this?