I do
http://www.redcross.org/services/biomed/0,1082,0_19_,00.html
every 2-3 weeks
They should give you TUMS for the lip tingling and the arm vibration is normal
My Dad died from cancer and anything my platelets can do for someone else is far more imporatnt than my discomfort for an hour or two.
BTW - I am not fond of the Red Cross - for the way they handle money etc. but that is the only place that can allow you to help others