I do sympathise with you here and i can for sure throw some light on this because like you i have tried many useless devices to be rewarded with no success hardly at all.

You might like to try one of the hearing aid centres that do have a good range of devices because there is always something that will suit you somewhere along the line.

I dont know what kind of deafness you have if it is middle or inner ear probs but i can tell you that if you have any success with in the ear headphones it will be possible to get one of the very cheap in the ear headsets with a mic to work for you, the problem of course being if you are totally deaf in one ear it would have to be mono output to the working ear.

People just dont realise that hearing aid users especially those that only hear or use one aid can only get the sound in that hole and one ear does not give you directional sound but everything in one mixed up noise from all around you lol.

Loops are useless by the way as the rf output from the mobile only makes the damm thing buzz like mad as you will very know !.