5.5ish months pp mood swings

Did anyone else find themselves getting major mood swings and being super irritable and anxious around this time? Also something I should probably mention is that I’ve been breastfeeding for over a month now (switched from exclusively pumping) and have been wondering if it’s possible that has something to do with it. When I made the switch, I had to lower my supply a ton, could that mess with my hormones? I had a very short period recently around the same time I switched. I’m hoping this gets better soon because I hate feeling so angry. I wasn’t even this irritable pregnant and I know my man is noticing it. He doesn’t blame me but I still feel bad. Could it be late onset postpartum depression?