Hi @Silva, sorry you are in this situation. You certainly have had a bad run with your health. I do understand what that can be like and my 50's have been plagued with health issues and multiple surgeries.
You can do this, you have to get through it, get all those health things sorted and start healing. Big breaths in, try not to over think, calm that brain down. It is normal to get overwhelmed. You are getting way too ahead of yourself. One step at a time. Deep breaths and do that often.
@Fraser sums it all up very well and makes good suggestions including seeing a counsellor who can give you something strategies to get through all this.
Wishing you all the best.