The females in my family that have tried the shot have either stopped their periods or had them continually. The higher percentage having it continually.
Also, one that stayed on it for a few years waited about six months after stopping to have a normal period and then could start to try become pregnant. All had mood swings and a bit of weight gain.
Not that you have to worry about some of those side effects, Im guessing the getting prego part is out.
You also have a great number of choices now that you are smoke free, even as you are older, well depending on your history and partner and all that. But still, its good all around
I however would recomend the tubal in your case, an overhaul and rewire is a fabulous thing. Next time you have insurance coverage check it out, most plans will cover 100%.