Anxiety about so many changes so fast

Hello to whoever might read this. I’m a 27M. I currently live with both parents and a dog, we split the mortgage. I have ADHD, as well as anxiety and depression I’ve been working with for 10+ years. Medicated with lexapro since 2019, and started therapy again last week, looking to start psychiatry soon. With some background out of the way, I have had so many life changes so quickly I am struggling to cope. Anxiety and depression have been giving me a real tough time. Sleep and appetite have been awful. Mood has been swinging from happy to sad at the drop of a hat for no reason. Anxious thoughts have been taking control every now and then. The changes:

I went to Korea for 10 days recently. I went to visit my girlfriend who I will marry someday (we’ve discussed this and I got her dads blessing on this trip). I got home and started a new job. Historically I start a new job, it goes great throughout training, then when it comes time to work I shut down. I don’t wanna go in, I cry a lot, can’t sleep and can’t eat. I quit the job and this all disappears….. but then I’m jobless. The quitting job from dissatisfaction cycle has gone on for 4 years now. Idk why I shut down when I work. I held a job from 2019-2021 that was hard as **** with no problem. I worked hard, had balance, and slept great. This job I got like 2-3 days in of easy training and collapsed again. I’m still working, didn’t quit, but I am STRUGGLING. I miss the love of my life. This new job makes me uncomfortable. I can’t sleep. I have no drive anymore. I’m working thru therapy and I know it takes time but I just don’t know what to do to get by day by day to get there. Thankfully I never get any thoughts of self harm or anything like that, but it’s still so effing hard. I try to remind myself of all the hard times I’ve been thru and that I’ve come out the other side, but idk my mind has been racing so much and I’m struggling to cope.