Welcome to Health Care magic. I understand your concern. As per the complains you have given it seems to be a case of obstructive sleep apnea. But other conditions like congestive cardiac failure can also cause these symptoms. Also anxiety or paniac attack due due a bad dream could also trigger such episodes. So would like to ask some queries like is there a both lower limb swelling which has increased recently.If yes you should undergo a test named 2 DECHo and follow up with cardiologist for opinion and further medications. For sleep apnea-Sleep study is advised but opinion of general physician is required. For anxiety just need some relaxation exercises like meditation. Thanks and regards. Take care.