Woke up feeling randomly very lightheaded and it has lasted all day

27 y/o male PMBCL, 1 year post DA-EPOCH. Seems very spontaneous, I don’t feel sick. I have been feeling hungry all day even with me eating throughout. I took a nap for a few hours to try and see if it helped, woke up feeling hot and sweaty which hasn’t been a thing since before chemo for me. And it didn’t help. I had SVC before chemo so I’m panicking that that’s what this is. I’m waiting to see if it persists tomorrow before calling onc team. If it’s relapse and it’s SVC, I haven’t had any other signs yet to indicate as much. I can’t stop thinking about it, any experiences from anyone else to get any info about what it can be? Suggestions?

I’ll add that me, my wife, my sister, and her SO came in contact with someone who was previously sick (they had residual) and both my wife and the SO got a headache that lasted exactly one day after (not actually getting sick themselves), but it’s been 6 days since so it seems unlikely that this event would explain my circumstances now.

Thank you!