if you like talking to people, but dont want to be in sales, how about some sort of support role- like a service manager type role. many industries have this type of role and it can be well paid and wont nec mean you have to go back and study again.
oh and just on going back and studying... if you are only 28, you have another say 40 years to work (daunting eh?!) so 3 years to make you happy and rewarded and fulfilled may not seem so bad in the long run!!
I worked in marketing and career changed at 37. Took a year to train on PGCE for primary. Was the best move I ever did! In hindsight I was lucky as I left a marketing job in the financial sector, trained, qualified and got a job JUST before the world economy went tits up.... and everyone suddenly wanted train as a teaher! As a single parent as well I feel someone up there was looking out for me.