Should i talk to my mom about trying to lose weight, or not?

I am 16 and i have been trying to lose weight for awhile now. I am also taking medication for anxiety/depression so having body image issues doesn't help those. I use to go to my mom when I was worried about how i looked or about losing weight but now i feel like i cant. I read an email she sent to my father that said that she was very frustrated with me, I ruin her day when i call her or text her about my issues, and that I complain about not liking myself when i dont do anything to fix it. I asked her about it and she said that's how she felt and that she needs to vent to someone because she is having a hard time too. My therapist told me to keep trying to talk with her but I am afraid to now. Most of the time I just want someone to talk to so I don't feel like I am holding everything in, but now i see that's not helping anyone. What should i do?