Genuine question: what is wrong with going to the hospital if you need it? People are getting sick with coronavirus and they are taking time off (typically 1-2 weeks), which means you wouldn't be the only one taking time off if you did go to the hospital. I am not saying for you to pretend you got coronavirus, but I am just pointing out that lots of people are taking time off during these dark times. Also, employers are being more flexible and lenient in general.
I know you went to the hospital 3 months ago, but if you personally feel you need it, then I think your life matters more than any job in the world. Jobs can be easily valued in terms of money, but a life is not something we can assign a monetary value to. If you lose one job, you can try for another. If you lose your life, you cannot try for a second life. I hope that makes sense.
If lamictal is cancelling out the ketamine's positive effects, how would you feel about stopping the lamictal?