People wit 2< chronic illnesses: Does anyone feel like they're "catching them all"?

The last 5 years I've been diagnosed with 3 chronic illnesses and might be diagnosed with number 4 soon. I'm young and yet I've started writing my will as I don't think I'll make it to 35 if things go on like this.

What has your experience been? Have any of you been through something similar and if so has it gotten better over time?

How have your experiences been with working?