What kind of meds?
Reading your post reminded me of what it felt like in my home when there was an active addict living here. He also had abandonment issues and anxiety problems. The simplest of things could be turned into complete chaos. A trip to the beach with awesome fun friends was turned into a stress-filled angry nightmare. One minute normal, one minute nuts, one minute apologetic.
He once called me a stuck up b**** because I declined to fight in the street with him, on a stranger's doorstep.
I had no clue what was going on, but later came to believe it was crack related. After he was gone I found evidence including "smoke rock" written on a piece of paper and a weird looking aluminum can with residue on it.
He was only here about three weeks, but three days was enough to drive me insane.