The thing you need to understand here is that what you are feeling is normal.... but exacerbated by your health concerns. I still get them from time to time. In fact in the middle of one right now. Loss of energy completely and swimming head. No idea why.
But all these movements with meds are likely to trigger responses in your worry centres. You have a combination of both physical and mental contribution to these situations. It is better just to see it as it is, and think to yourself "this is going to be the way for a bit". Putting undue stress on yourself for feeling this way will only make it worse. And in knowing you fairly well, I know this would lead to unfounded worries in the way that ever decreasing spiral hits us all sometimes.
Accept what is likely, but dismiss the rest as a symptom of the first.
Eckhart Tolle just did a upload on YouTube about overthinking "Is it THAT bad". I don't have the link to hand, but that guy speaks a lot of sense.