miserable, exhausted, to the extreme

My doctor prescribed me meds for my extreme nausea and migraines. But from the time I wake up until the time I go to bed, I am so exhausted! I showered this morning and had to take nearly 6 breaks in between because I felt like I was going to faint. I know it's normal to be this exhausted but when I get to the point where I feel like I might faint, it kind of scares me. I eat a lot of fruit (strawberries and lemons have been my lifesavers) and pickles. I try to drink water but it makes me so so nauseous so I add some fruit in the water to give it a little taste. But I need some more advice or tips!! I'm desperate! It took all of my energy to type this lol ugh.