Stop Smoking Weed?

Me and my boyfriend has been together for a year and 3 months now. When we met i told him i smoke to relax (i suffer from PTSD) & he's been trying to force me to stop. I had a really awful childhood which cause severe anxiety attacks .. the pills they gave me to calm down always made my stomach ache or i became nauseous, so i started smoking🤷🏾‍♀️ right now we're in an argument because i smoked last night & he's pissed .. what should i do?