Last Night I Took A Few Too Many Of My

Last night I took a few too many of my trazodone medication (not a dangerous amount at all, literally only a couple hundred mg) and ever since I've felt extremely dizzy. I thought I'd just sleep it off and throughout the day today I'd be fine but every time I stand up I black out and have to sit back down again in fear of fainting, although most of the time it's unsteady falling and my legs go limp. I also have a really painful headache. I've been keeping really well hydrated and eating well as I know that can cause dizziness and I'm getting up really really slowly so it's not that I'm standing too quickly or anything. The dizziness hasn't improved throughout the day - if anything it's become worse and I'm really nauseous now.. I'm 19 btw not sure if that makes any difference