Woke to use bathroom and couldn’t stand up -is this likely my anemia?

I (48f) was told I had anemia/ dehydration back in October. I haven’t taken much iron since it aggravates my gut. I do try once or twice a week.

I struggle with a mild eating disorder (restricting intake mostly but have vomited on occasion). I tried increasing my intake over the weekend and this led to a couple of rounds of purging.

Last night I woke with a very full bladder and very dry mouth. My immediate instinct was to get water and I collapsed upon standing. I never lost consciousness but couldn’t physically lift my body for 15 minutes. My heart felt weak and I became extremely nauseated. Elevating my arms -searching for a light switch- made the dizziness much worse. I basically could only lay there, eventually crawling to a water bottle. The water seemed to help and I fell back asleep.

Does this sound on par for anemia? Or is this dehydration? I feel weak and sore from falling but mostly back to normal this morning. Having gotten an IV in October, I’m terrified of needing that again ($) and hoping this isn’t a concern. Thanks for any input.