Welcome, Kelly! I'm Anne, 29, also a military wife! (Navy diver; 16+ yrs AD.) We have one son, Thatcher Holden, 22 months, and having been TTC #2 for about a year.
I'm so sorry to hear about your struggles... you have had WAY more than your fair share.

It's completely sucks that it's so hard for some people. It sounds like you have proactive doctors, so that's good.
A 7 lb cyst... wow, that's really big. I'm glad you're okay from it, although I know the last thing you need is one more obstacle. For what it's worth, I'll share a similar story: It took my sister 4.5 yrs to conceive #1. When she was 13 wks pregnant, she developed a massive cyst on her ovary, which cut off blood supply to the ovary and killed the tissue. They had to go in and remove it. (Thankfully her little girl was fine!) She was so upset about this since she already had so many TTC issues (including PCOS and endometriosis), plus the ovary that was removed was the one that had released the egg that got her pregnant the first time, so she viewed that as her "good ovary." (She'd been monitored closely during the TTC process, and conceived via IUI, so that's how she knew which ovary it was.) Anyway, the point I'm getting at is that she conceived #2 when her DD was 16 months old... it happened for her MUCH faster than her first time, even though she only had one ovary to work with... so don't give up hope. (I know... we get sick of hearing that phrase, but it's true...) Hopefully this latest obstacle won't set you back.
I definitely understand being frustrated about seeing people who started TTC with you already having babies already. One of my good friends had her first child a few months AFTER I started TTC #2... and now she's already 4.5 months pregnant again. It's hard to realize that in the time I've been TTC, she has delivered a baby AND gotten pregnant again... I'm happy for her, but just so frustrated with my body.
I wish you the best, and look forward to having you on this board!