TTC for several years

My husband and I have been together for almost 7 years, and married for 2. We've been TTC for the last 2 years, and no luck. I tried tracking, diet changes, herbal remedies, and nothing. My ob says it's just my weight (294 last visit on 9-16-15), but my PCP says it could be something else.

Most of my friends have babies or are about to give birth. I'm jealous of my sister-in-law, who wasn't even trying to have a baby. I feel terrible all the time because I haven't gotten pregnant yet. Whenever I think about it I cry for hours at a time....