Past week i have had nothing but insomnia and nightmares when i do go to sleep. have gained about 20 pounds in past month and half. not pregnant.

Have a physical: to r/o organic causes. Check your meds for side effects. Have allergies? (This time of year is bad...) How's work and relationships? How's your general health? Do you exercise? Using "other" drugs? Recently taken to video games right before bed? Gaining weight usually suggests an intake in calories...yes? Why? See a professional. Too many possibilities.