Can too much sex throw you into flatline?

I think i may have overdone it on the sex.
Rebooted for about two months with a FWB but used ED drugs to get hard.
Would get hard very easily using 5mg of daily cailis and it worked fine everytime.
PMOd like 2 weeks ago, slept with her Monday and was fine.
Went to sleep with her last night and had zero libido, stayed flaccid whilst she was naked for 20 minutes.
Eventually I got half hard and managed sex but it was awful.
Whats happened? Has overdoing it and orgasming too much caused a flatline?
My dick is so numb right now....