It a normal human phenomenon and about 50% of the patients feel that. There pulse rate/heart rate
and Blood pressure increase while seeing to the doctor or doing some fearing job like talking to seniors.
If you think that yo have a such kind of fear while you are donating blood or seeing to psychologists than need not to worry. Else record your pulse at different times for 2-3 days even during sleeping and during rest. If it is continuously high than you needs to be investigated that. Consult your cardiologist for that.