I took MTX for nearly two years. My stomach would not handle the pills at all, so I was taking the injections.
Like you, I would feel pretty good a day or two before M Day. I also took it in the evening, with chocolate and tea after my shot. I also felt very foggy and lethargic most of the next day. The side effects can be really weird sometimes. I used to get many of the ones that you listed.
I hope that it helps you.