Why is my vaginal skin in agony ?

[km23]

On the second last day of my 2 week holiday to Florida (with my boyfriend of 3 years and my family) I got 2 little spots on my vagina lips nearer to the anus end and thought nothing of it putting it down to sweat and sun cream.  Now, 1 week and 3 days later my vagina walls are in agony, they are swollen and burnt looking and there are some small spots surrounding them. At times it feels like the spots turn into blisters/lumps. I am not itchy and although there is additional discharge it doesn't have a smell and hasn't altered in colour. It doesn't hurt to urinate, but when my urine hits my vagina lips or anus it is agony, almost unbearable. There is what looks like an extra bit of skin going between my vagina to my anus entrance and that is what hurts the most, I can't touch it at all with my finger or toilet paper as the pain is excruciating, making wiping an agonising task. I have been to the doctor and she had no idea what it was - she took swabs and I am due results in 2/3 days. She told me to use sudocream to act as a barrier when wiping but this is making the burning sensation even worse so I have stopped using it. She gave me flucloxacillin 500mg to take 4 times a day for a week, this is day 4 and I haven't noticed much of a difference! Does anyone know what this could be or how I can relieve the pain? it is waking me up during the night, I can't sit down easily or comfortably, walking is an issue, the pain is constant and it has obviously put my sex life on hold (luckily my boyfriend is very understanding but at only 23 I would like to keep my sex life). I have tried ice in a towel and slightly warm baths, both helped slightly for a short period of time. I have been taking ibuprofen which is perhaps easing the pain very very minorly. Someone please help I can't take the pain much longer!