Chemo side effects already ? Or my over stimulated brain? Lol

I'm almost 3 weeks post my first chemo and will start my next round on Friday.  I was the same as you and always second guessing my symptoms.  I had bad bone pain and muscle aches (like I was coming down with the flu) within a few hours of giving myself the injection 24hrs after chemo. That lasted 3-4 days then gradually subsided.  No nausea thank god but a bitter taste in my mouth the following week.  This week I feel good physically (little tired and emotional) but just noticed this morning my hair is shedding.  I'm using a cooling cap for chemo but it was still confronting. And now I'll just stress about that too.  I think half the battle is trying to stay positive but also preparing yourself for the next symptom so it doesn't shock you too much. It's hard.