SSRIs like Lexapro can take about a month to 'kick in' in my opinion. I am a big supporter of these medications when they are combined with talk therapy. I believe they will/do help with tension. For me, it actually increased my anxiety level a little in the beginning, but in the long run I think they are good at what they are designed to do...keep us posted!
Quite often doctors will also prescribe a benzo for a short period of time while the SSRI takes effect if the anxiety gets really bad, but if you are doing ok, then just stick with what you are doing in my opinion...just keep working closely with your prescribing doctor.
is it the tension that causes phyical symtoms?