I think it may be due to your ED. They can cause cramping in ANY muscles, not just your legs and it is more than likely due to the purging (both via vomiting and laxative abuse (and it is laxative abuse as you don't need it for it's true function even if it's not all the time/ in high quantities that you take them)) as this alters your electrolyte balance causing changes to how the muscles/ nerves work which can lead to cramping. As well as that a lack of food also won't help as though you've gained weight it may be that you're still not eating enough and your body is breaking down some of it's muscle mass at points too which can also be painful, cause you to lose some strength in your muscles and lead them to become tired earlier.
There are also other reasons for cramps however so these do have to get checked out and with this I'd mention your ED habits and so they can take these into account and maybe take blood samples to check your electrolyte levels if they feel that is what's needed.
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