Anaemia is definitely an issue with heavy periods I had several episodes of anaemia in 1st couple of years of having periods.
It can make the bleeding heavier (ironically!) and of course cause other symptoms like fainting, dizziness, migraine, blurred vision and palpitations (which can be terrifying for a young girl who doesn't know what these are - I had an especially bad set once and thought I was having a heart attack!)
Anaemia caused me to pass out and fall several times, my school at the time was an old Victorian building laid out over 3 floors with stone steps between floors and I once spectacularly tumbled down a full flight and cracked my head due to a fainting spell.
Sometimes iron rich diet simply isn't enough, you need vit c to absorb iron best anyway and no iron blocking food/drink being consumed at the same time so whole diet needs looked at. Even then sometimes supplements are needed.
The cold water bottle thing I discovered by accident! I was in a painkiller induced fugue and reached for what I thought was a hot one and applied it and it helped! My pain wasn't always centred on the uterine area, I didn't understand why at the time as was undx but when it was later dx and properly investigated the pain in my chest, upper abdomen and lower back made sense as I had large patches in those areas.
Much has been removed by surgery but they obviously can't remove every cell so it regrows slightly, medication can keep it at bay.
Quite honestly simply having a dx was a relief! So much so that when the dr told me I cried and they mistakenly thought I had misunderstood or didn't have the knowledge to understand that it was a treatable condition but I explained I had known for 14 years there was SOMETHING wrong gynaecologically I just couldn't get ANYONE to believe me! Not even my mum.
The dx led to us discussing in more depth and when I told her she apologised. She thought I was exaggerating/being a drama queen! Even though that's not in my nature at all, I'm actually quite a stoic type when it comes to pain/illness (possibly as this was usually the worst pain I had to deal with on a regular basis - when I had appendicitis and other well known to be painful ailments I barely raised a concern as in comparison to the period pain it was much milder!)
Shocking to see even on this thread so many women brainwashed into thinking hormonal contraception is a cure for such things - it's not! It merely suppresses/masks the symptoms, this can lead to the sufferer thinking all is well while the undx condition continues to cause damage.
I've at least 2 each of friends and relatives who couldn't have children as a direct result of such actions, one had to have a full hysterectomy at 27 years old
I was VERY lucky to eventually have dd but the pregnancy was not straightforward and the endo indirectly caused complications with the birth.
It's 2020 we really shouldn't be STILL having to fight to get acceptable gynaecology treatment in a developed country!
@Elsiebear90 and others the pill:hormonal contraception is NOT the only treatment don't be put off by lazy ill informed hcps, there are several surgeries and medical treatments which can help even if "temporarily" - but "temp" meaning several months or as much as a few years! I had great success with prostap the first 2 times I used it unfortunately not so much the 3rd time
I'm currently - thanks to an understanding gp- on noriday continually which is meaning I'm not having periods at all which is by far the best option - they are NOT a necessity!
Sort of off topic but not as women really struggle to be taken seriously by hcps on all matters so she needs to do this.
Work on her confidence and assertiveness too, even do some online training it's an essential skill for life really