Hello, I'm Married 33 Yrs Old & Have Four Kids.

Hello, I'm married 33 yrs old & have four kids. I'm super fit athlete & enjoy great health in all aspects. I have an excellent relationship with my wife & make love with my wife almost daily. I had few really stressful days two months ago & during those days i started facing problem in love making. I've been unable to achieve hardness or sometime maintaining it. I consulted a local doctor regarding this issue & i got my thyroid test, lipid profile , fasting blood sugar & testestorene. All tests were within normal range but testestorene was 334 which is within normal range but close to low level. Doctor advised me arcalion 200mg x 2 in breakfast & Ginko Biloba syrup twice a day. It really helped in the start. I felt energetic again & also successful in love making. I stopped medication after one week as advised. I got testestorene test again which was 581 this time.
These days I'm able to achieve & maintain hardness in the morning but in the night i have no desire for love making. What I should do to overcome this issue?
Thanks & Regards
Salman.