Severe Night Sweats

My boyfriend is 19 years old (almost 20) and has the absolute worst night sweats. Like we go to bed and just a few hours later he has soaked through his clothes (usually he's just wearing shorts) and the blankets and his side of the bed is drenched. So I usually get up half way through the night to get a new blanket. And then after a few more hours he has soaked through that one too. I even tried just giving him a thin sheet and he still sweats through it. The house can be 60 degrees and he will still sweat profusely in his sleep. I can't even sleep with him anymore because if I happen to roll over and touch him then I'm soaked too. Like he literally just drips sweat. He feels so disgusted and upset and embarrassed and I don't know how to help him. He has had issues with anxiety in the past but it's been under control and he never experienced night sweats before. He's going to the doctor on Friday but I just would like ideas on what it could be. Every time I look it up (I know it's a bad idea lol) it says stuff about menopause (obviously not haha) or lymphoma. So it's scaring me. We have been together for 3 and half years and have lived together for over 2 and he's never had night sweats like this before. Any suggestions on what to do if you've had them or any ideas of what it could be?