Wise folks here and you have insights already Dougaldog that took me a long time to realize about my partner and me.  Things will only change when you decide enough is enough.  Your partner may change or they may not.  You can be supportive of them but it cannot be at the sake of your own physical or mental health.  I think if you feel dread at 6pm everyday, your physical body is giving you warning signs that it does not like your situation.  Eventually your health will be jeopardy or your partner’s actions will hurt you badly in someway.  Peace and good health are worth any sacrifice or suffering you have to go through.  I left my established comfortable life a few years ago and uprooted everything to go a new city to be near people who supported me and help me recover.  There are probably more people that you realize that will help you.  It was not easy to start over (I’m in my 50s) but I grew and learned a lot.  I worked on my spiritual life, got counseling, went to support groups, took lots of walks outside, talked to my sister a lot, and tried new things and opened myself to new possibilities.  Life went on and I became healthier.  My partner is in recovery now and we share a better love, 2.0, ha!  Blessings and peace to you on your journey.