Yes.
The morning wood will comeback with time, if you really want to maximize your chances to notice the morning wood, you will need to wake up early at the same time everyday.
minoxidil does leave your body.
I wouldn't worry. The problem is mostly in your mind..... or your body is actually very stressed/exhausted and dosen't care about sex, it's in survivial mode, give it time to recover....... your problems may not even be because of minoxidil but i would still throw it away.
Chill and try to do the imagination without toutching, every night or every other night to practice. don't freakout if you cant get it up yet, give it time. Make sure to not bust a nut, you need to build up your sex drive and release every 7 days only if needed.