If you have a COBRA option, it's valid for 30 days after termination. Unless it will cover 0% of your weekly charges (out-of-network or some other such clause) I'd say for you to call them on Monday morning! If you are eligible for COBRA, they have to take you cuz you're still under the protection of your former group insurance. If they'd pay anything at all over what the premium would be for April, I'd have to think it was worth it.

We're thinking lots of positive thoughts your way! See you soon.

There's hardly anything like the "there's something wrong but we don't know what" stage, particularly with something like this which is internal and has no apparent treatable symptoms. It's an awful void into which our imaginations run screaming.