Gaining so much weight 😣

Hi ladies I’m 20 weeks 5 days pregnant and have gained 50 pounds since getting pregnant !!! (I didn’t even know that was possible) 😭 pre pregnancy I was at a healthy 155 lb and had a naturally slim shape. Since getting pregnant I just keep expanding and even though I don’t have the best diet I’m definitely not eating enough to have gained 50 pounds!! Did anyone else experience extreme weight gain during pregnancy? I have an appointment coming up later this week with my ob and hope she can help give me some solutions. P.S. any tips for easing feet/leg pain, all the extra weight has put such a strain on my body 😩