have a similar issue with cialis, well actually it just takes longer sometimes up to an hour..
I'm 49 BTW.
If as you say there not working the try herbs, look youdont give an age, me I'm an oldie 64 coming 64, so I'm on DHEA, but you must read about first and see how this fits with you, then there is the cayenne, garlic, green tea and ginger, these last 4 all help in getting blood down below, you can Google them all and just add ED on the end of them, then there is borax look at that on earthclinic under ED, and tribulus this is something I'm just starting to take as they say it sits well with DHEA.
And one last thing you could try is the 5Gs just Google it and look for pegym, all herbs and a cheap way if it works to get your erections.
Hope all this helps.
Good Luck