feeling low

Hi i just need to sound off with people who understand. Sometimes I wish I could stop the autism winning but I can't always. Dreadful musicians practise last night (I'm a church worship musician and I play keys/synth). Our normal lead singer and lead guitar are away so it was just me, drums and bass, with an inexperienced singer. In the first 2 songs we did the house sound was so loud I couldn't hear myself or any detail through my in-ear pack so I had no idea where in the song we were. The leader claimed he couldn't turn it down??  Then the drummer had to go early so we had to spend the rest of the practise without him - he operates the in-ear sound and the backing tracks. that meant we could only have the backing track in the house instead of our ears. It was too loud, It was out of sync with the metronome click with was then out of sync with the singer so I didn't know what was going on, then the next song he decided to do in a different key from the one I'm used to playing it in, then the last song he changed and put in an extra line and a few extra chords so I had no idea where I was and what I was doing. STRESS!!!! The bass player was being very polite and just going along with it but I was so cross, all I could do was 'shut down', stop playing and just stand there. I cried all the way home and now I don't know what to do. we are supposed to be doing these songs on Sunday and we livestream the service too so I need to do it, but right now I want to stay in bed til Sunday's over. I wish I could stay calm and work things out with him. i am an an experienced musician after all. last night wasn't beyond my capabilities