Dealing with depression.

So I've been suffering from depression for a little over a year now.. nothing major. But I recently went to the doctor about it and he put me on lexapro for depression and anxiety. My mom is freaking out saying I shouldn't take it but I just feel like it's only getting worse and I want to be better already. The side effects aren't too bad.. the muscles in my mouth are really tight and it's causing me to grit my teeth at night. And I have insomnia after waking up in the middle if the night. I also have lost interest in sex. Ugh but doctor says in a few weeks things should get better. I'm hoping to hear some positive things from you guys, maybe if you've gone through the same thing you can lift my spirits? : *