gastroparesis part 2

So I'm tired alot. It seems to be related to what's going on with my gastroparesis, but it's freaking annoying because I'm not tired all day. I'm just tired suddenly later in the day. I want to do a regular amount of stuff sometimes and just can't. I'll be planning on doing something then it gets to the moment and I realize I'm SO TIRED. I'm starting to wonder how likely it is that I will be able to do anything at night unless I specifically rest up all day in preparation.
On a different but still annoying side of my gastroparesis, I am trying a medication that I'm afraid will not work. I have to take it 30mins before eating each time I eat and it can be taken no more than 4 times a day. I've been on it for two days. I am struggling with the remembering to take it and that makes me wonder how I could be on it permanently. Also it hasn't done anything yet except make me feel slight stomach pain. No difference in symptoms. I have been informed by my doc that 2 days isn't enough. Most people notice chance after a week or two but I'm supposed to give it time and wait 2-3 months. Honestly if it doesn't work after two weeks, I don't know how I can justify to myself taking it longer. Especially since I think I'm managing it pretty damn well without meds. Whatever.