Vitamin deficiency, in bed all day?

Hello.

I have a huge problem! I'm 24 years old and have been lying in bed for months because I have no energy. I quickly lose energy. For example, I clean, and then I lie in bed for hours again because I'm exhausted.

I went to the doctor, had a blood test, and was diagnosed with iron deficiency. I've been taking iron supplements for three weeks now. Some days I have energy, and other days I just lie in bed and can't get anything done.

I think I have another deficiency besides iron deficiency, because the tablets make me a little fitter, but only maybe 30%.

I would like to have my other vitamins checked as well, but my doctor wants to charge me 30 euros for each additional vitamin.

Isn't something like this usually covered by health insurance if there is a suspicion?

I'm starting to run out of options.

Thank you!!