Your post sounds exactly like me 100%. I could have wrote it that’s how much it mirrors me. I feel horrible saying this but it gave me comfort that I’m not alone and not going crazy. I feel like a failure that my adderall is now the only thing that helps me get through just doing basic paper work or maintaining friendships. I have a good three to fours hours in the morning and then I’m done. My brain fog gets so bad too I can’t even comprehend the basic conversations mid afternoon. I get so winded I can’t talk on the phone for a long period of time plus it spikes my heart rate.