I Am 27yrs Old Lately For A Couple Of Days

I am 27yrs old lately for a couple of days now i havnt been able to hold any urine if i dn rush to the restroom rite away i go on myself which has happened twice now..my urine tends to burn after urination or after i have had somthing to drink well even times after i have had a hott shower..i kno i am not pregnant and i have been getting ny menstration regularly and hav recently went off even during that i had burning sensations Now recently i hav been having light headed moments that comes more at nite weather i am laying down or just sitting and at times i have to shake them off hav made an doctors apt but they arent able to see me til the middle of january 2016 could u tell me what it mayb.