Hi For The Last 8/10 Weeks I Have Had A

Hi for the last 8/10 weeks I have had a rash the appears and disappears daily all over my body and itches constantly when appearing. My doctor had requested I see a dermatologist which I still await an appointment.
About 7/10 day before the rash appear I had a yellow fever + tetanus injections fro the doctor to travel to South Africa - could the rash be linked to these injections also I had an increased heart rate when I went to see my GP could this also be a result of the injection. I have high blood pressure and because of the heart beat increase the doctor has put me on blood thining drugs. Thanks