I just left my engineering job at a medium-large employer to join an 18-person startup. I am set to start the new gig late next week.

I found a marble-sized lump under my armpit a few days ago. I quickly got it checked out, and the preliminary report just came back that it's probably cancerous.

What the hell should I do?

I'm 25, and otherwise healthy, so was not expecting this.

I really care about this new team and was excited to work with them. I feel horrible about joining a young business as an albatross instead of an asset.

I left my old job on good terms but have no idea how they could justify re-hiring an employee who left and may not be productive / able to work.

If I start at my new job I'm afraid I will endanger the business and raise everybody's premiums. I think they have a fairly generic group plan.

If I don't start my new job, how will I support myself?

My fiancé also works at a small startup so if I joined her insurance the same issues would apply.

I think I can still purchase my old insurance through Cobra, but I don't know how long that will last.

Thanks.