Blood test. Afraid.

So I just got the blood test I've been putting off since the begining of sept after my MC to see where my hemoglobin is at. I feel so sick. I got hot and my head started to swim and I could hear my heart beat in my ears. I was so nervous about getting it done because I didn't know if my vein was good anymore after an IV was in it but it's still a good vein so it was easy that way but all I can still remember is the pain and how afraid I felt in the hospital. I was scared I wasn't going home to my son. I was afraid that the last time I was going to see him was putting him to bed. I'm now afraid again I'll miscarry and it'll be bad again if we made it this cycle.