Hope this helps:
You could get sick to your stomach if the sight of blood bothers you or if you’re afraid of needles. Don’t feel bad -- this is common. You might even have what’s called a vasovagal reaction. This physical response from your nervous system could make you feel dizzy, break out in a sweat, and cause your heart rate or blood pressure to drop. You could even faint.
Relaxation techniques like deep breathing may help. You can also look at something else to distract yourself.
If you feel dizzy afterward, lie or sit down and put your head between your knees until you stop feeling lightheaded.
Over the next day, you may see redness or bruising where the needle went in. The spot might be a little sore, too. Most side effects go away soon afterward.
The doctor might tell you to drink plenty of fluids, avoid alcohol, and not to exercise for the next few hours.
Have a blessed day,
Ethan C. McCaffrey