Thanks for writing to h.c.m.
I have gone through your query regarding difficulty in understanding spoken words some times for loud & some times for light sounds, you also feel difficulty in conversation on mobile phone also.
Your all above symptoms are clearly indicating that you are having loss of differentiation of heard sound and you can't differentiate phonetically balanced words. This is characterstic of sensorineural deafness
. I think your doctor had very correctly adviced you for hearing aid
but if you are interested for alternative way of treatment than you may consult your E.N.T. specialist for cochlear implant
I hope above answered your query.