I'm not sure if this would be applicable to you, but a fluticasone propionate nasal spray (Flonase, for example) can help with post-nasal drip while you are sleeping. It can take a week or two to begin working, but it helped alleviate some of the morning asthma symptoms/chest congestion I was having. And obviously, I would discuss it with your provider before trying it. For the snoring, have you discussed the possibility of a sleep study to check for something like sleep apnea? I have not done one, but I know that that can sometimes be an indicator of that or a similar condition. And this sounds weird, but I've heard of people using a light adhesive fabric medical tape to essentially hold their mouths closed at night. Unfortunately, I have kind of the opposite issue (clenching my jaw, so I have a bite guard), so I cannot speak from personal experience. I found out about that technique from some reviews on a cloth tape that I use for my finger joints (Nexcare Durapore Durable Cloth Tape, if you are curious). I know that my situation isn't exactly the same, so I apologize if this doesn't help. But I hope that you find something that works for you!

Flonase does work but it can cause nosebleeds! (At least it did for me) but it is getting close to allergy season so maybe make an appointment with your allergist! I usually get prescribed a steroid inhaler during the allergy season

um if I feel an asthma attack coming on I sit down criss cross and put my hands behind my head. Breath in for 4 seconds hold for 6 seconds and breath out for 4. Um if it helps think of smelling the roses and blow out the candles. That's what my mom used to tell me when I was younger and it helped a lot expecially if I didn't have an inhaler on me. Um Benadryl is a really safe over the counter medicine can can help during allergy season. Guafasin can help break up any mucus and lessen coughs it's usually in things like Mucinex. Aleve cold and sinus helps a lot too if you're coughing a lot. I have pretty bad allergies in fact I am still kicking mine after over a week from going to a city that has a lot of cedar and I'm really allergic to cedar pollen.