Its really hard to day without more information. You should talk to a doctor. Some other things that could be causing this that noone else has mentioned yet(I can’t tell if this applies for you or not based on your post):

• not enough exercise
• vitamin d/c deficiencies (you can take supplements of vitamin d in winter time)
• bad gut microbiome. Try to eat a variety of vegtables as well as prebiotics (fibre, oats) and probiotics (yogurt, kefir, sourdough ect).
• try to get regular sleep. I know this is your problem but there may be some things you can do like have a set bedtime, no screens for a while before bed.

Remember that many people have had similar problems and overcome them. You will just need to work out what works for you. Good luck.