Sort of struggling with personal issues while job hunting (need advice)

I actually just got hired for a full time office job that I start on 04/04/25, which is good, but here is my issue. I am suffering from severe issues with confidence in myself right now for a number of reasons. I worry that I lack good judgment. Other people (who may have spoken too harshly to me have even questioned if I’m employable). Based on some things that my father has told me I may have had some trauma to my brain when I was a baby. I have a serious neurological disorder now as an adult (epilepsy) for which I have to take medication to control my seizures. The great news is that I can drive and I have not had a seizure in a very long time. However, my medication sometimes causes me to get foggy when I’m having conversations with people, I might forget what I’m about to say, or I might put my foot in my mouth by accident. Back in October I got fired from a job working in a Target food distribution center because I absent mindedly brought in a metal fork and knife with my lunch. I didn’t connect the dots at all that those items could be classified as weapons under the company policy and have wondered if my medication and sleep deprivation may have been contributing factors towards my lapse in judgment. I didn’t argue with Target at all but I felt very embarrassed and stupid. I have also been substitute teaching and even full time teaching for years. I had to stop full time teaching after we had our son and I’ve recently decided to stop substitute teaching due to the amount of combative and oppositional behaviors I’ve been seeing from students. As a man in the classroom as soon as I open my mouth to try to shut down any crazy behavior I come off as threatening and have no leg to stand on and school administrators have not been supportive of me at all. For those reasons I’ve decided not to continue in education. Within the last 6 months I’ve gotten fired I’ve decided I can’t continue doing education, which is something I used to love doing, it just feels like those people who used to say that I’m unemployable are winning now and I hate it. I’m glad I was able to get a full time office job even though it’s entry level but I’m terrified something random will happen and I’ll just get randomly fired. I’m also searching for a second job to do at night to save money to put my son in a good school and am so far not having any luck finding anybody hiring. I’ve got no criminal record, I have lots of job experience, I have a bachelors degree but not in stem (criminology – useless I know). Tell me what you think guys am I screwed? Do you guys think those people are right about me being unemployable?