Being female is rubbish

Well first of all congratulations on your journey so far-

Secondly, I would be going back to the doctors to find out why your periods have suddenly become so heavy?

Give yourself some slack around that time, but keep eating healthily else you will feel blah both mentally and physically x

and ask your pharmacist about the dosage of iron tablets as you may need to take them over a prolonged period, but should always seek advice first x

Definitely see a doctor - err, a different doctor.
It is normal to start seeing lighter periods, more regular periods and lighter cramping after losing a good chunk of weight.
Not common for them to get worse.

Being female is Rubbish.. lol well, certain weeks it is anyways

I know all to well how you feel. I have lost 40lbs since jan and started lifting heavy this past spring. It was around that time that I started getting massive migraines that were cycle related, and very heavy periods that went on forever. I have just finally gotten things figured out. Hormone imbalance due to a change in the bodies chemistry due to the weight loss and lifting. It just needs time to adjust itself. I would see a dr if I was you. I also went to a naturopath and am on some herbs that have helped a lot (chaste tree).. I am also on a good fish oil which does a world of good.
good luck.. Hope you get it all worked out.

You didn't mention your age, which can be a contributing factor as well. I know after I turned 35 my cycles changed quite a bit and when I turned 40 they became almost unbearable due to the hormone changes. I was put on Loestrin FE (birth control) and that helped tremendously. I am 42 years old now and my cycles are regulated and normal. I also have very little PMS symptoms (except a bad headache for the first couple of days of the cycle) and almost no cramping. I would agree with the other posters and either go back to your doctor or see another one. Good luck! And congrats on your loss thus far!!!

Doctors are usually not trained in nutrition; their advice to "just take an iron tablet" isn't the best option. Most of the iron in tablets does not get absorbed.. the most well-absorbed iron comes from eating red meat and, to a lesser degree, iron-fortified grains such as cereals and bread.
I have terrible periods and faint/throw up for one day of every month. The only thing that makes me feel better is eating red meat most every day, even when its not my menstruation week.

Let us know what works for you!

That's definitely a hormone imbalance, but you might track it for 3 months to see if it's just things that need to stabilize after changes to your system.

It's not a good idea to just let these things continue, though, y'all. Hormone imbalances can lead to big health problems, and I hate that most gynecologists consider them not a big deal unless fertility is involved.

There are some herbal and food routes to help balance things, but there is also a lot of quackery around involving that, imho. I found a gynecologist who has kept up with the research and actually suggested something that sounds to folks like alternative medicine, and I was floored! Yay! We actually went with something conventional, but it was such a good sign.

If you can't find an MD into research on OTC things, try to find a natural doc who is very conservative. But please don't let a big imbalance run for years and years. Frankly, the risk of different cancers go up (and sometimes bone density, cardiovascular issues, etc).