One nostril clogged when laying down and tightness and pressure in head when i walk around can stomach problem cause this ?

Clogged nostril: Not sure why there would be a potential relationship between a clogged nostril and head pressure and stomach problems. It's more likely to be a nasal anatomy or sinus problem, such as a deviated nasal septum, an enlarged turbinate, or some other obstruction to sinus drainage. See an otolaryngologist (ent)! i don't think it's your stomach.