How old are you? I also had my tubes tied with my last baby, and within a year or so, I noticed my cycle was changing. I thought it was because I was nursing, but even after that ended (about 2 years after giving birth), it stayed irregular, painful, and occasionally torrential.
Dr said same "hormone adjustment", blah blah blah. Finally after 3 years of hating it (and hemorrhaging!), I saw a different Dr who ran a couple tests and told me I was perimenopausal (I was 39- but it can start even earlier), and that I could try some homeopathic or all-natural progesterone cream for 6 months and see if that didn't help.
MIRACLE!!!
Within 3 months, my period was regular, much lighter, and I felt less on-edge. I still use it, now 45 years old. Went off of it for a while, but within a few months, I was back in the old pattern (or lack of! LOL). Now I can see where I'll use it for as long as I need to.
Anyway, not sure if this relevant to you, but thought I'd pass it along. I use Emerita Progesterone cream- no estrogen (don't need it)- smallest dose (1/4 tsp, 1xday for 1 week, 2xday for 2nd week). Check with your doctor for your own needs, of course.