hey there - mate you are not alone, i have that same issue. If I'm able, i will try to get myself to do a bit of piloting such as a steep turn or 2 or mentally rehearse a forced landing.. really anyting just to get my brain back under my control. Then some time before I call tower or the CTAF inbound call i mentally run through how I plan to approach the field, reacquaint myself wtih the speeds (and rpm's to get there) and just relax. It seems to help, when I can remember to do all that.