Suggest Medication For Constant Dizziness And Loss Of Balance While Walking

Hi, im 31 years old, always been healthy but for the last year since giving birth to my 4th child i constantly get dizzy, feel drunk and incoherant when walking. I often walk sideways and trip and fall down. I am always losing my balance, even when sitting on the toilet. It gets a lot worse when i walk indoors and i usually get that bad i cant see and have to hold onto shelves or sit down for a while to the feeling passes. I am also losing feeling in one of my legs all the time and not being able to move or lift it at all for up to ten minutes. I have no idea what to think. any ideas? thanks kristy