Hi. i had gone though your quey. It may be due to medicines that have you taken specially beta blockers,need to consider and check. 2nd if you have diabetes or hypertension then it may cause erection problems. 3rd is stress and lifestyle stress and busy life style make u fatigue and secondary to this it makes less desire in sex and erectile problems 4th Relationship free communicative and mutual understanding will help sex is mutual act so try to do mutually and tell your problem to partner this will reduce your anxiety and able to erect easily so stress free lifestyle and mutual communication will help Investigations like Routine check up,penile Doppler to know blood flow and chance of erection with medications etc I hope i have answered your query. Thank you.