Very good post. I would say right now I am between stage four and stage five. A few weeks ago amphetamines stopped working for me I no longer get the euphoria or motivation even when taking larger doses that just leads now to brain fog. I normally take 60mg Vyvanse in the morning and 30-50mg Adderall throughout the day. 2 weeks ago I started 70mg Vyvanse in the morning vs 60 and it?s as if it didn?t even work at all. At first I thought maybe I got the wrong prescription but instead of my normal morning euphoria/energy boost I just got lethargic, anxiety and brain fog. The past few days I dumped a little Vyvanse out of the 70mg cap(probably 10-15mg) and I notice no difference. Same lethargy and brain fog. I just randomly started getting this brain fog and complete loss of desire to do anything. I experimented with a few things. 1.) low dose benzo .25-.5mg Xanax eliminates the anxiety and about 50% if the brain fog but lethargy is a little worse. 2.) one small hit of cannabis actually helps with the brain fog but more than a hit or two doesn?t help. But regardless nothing is helping so far in regards to lethargy and motivation.