sudden anxiety.

So I'm in uni and lately the uni experience has not been great lately. I've had breakdowns before but usually it's for a day and I recover. on Wednesday I was fine but then this wave of emotions and anxiety just hit me. I tried to recover from it but I really couldn't. And since then I've had no energy all I've done is lay in bed and watch tv I haven't even eaten properly. I missed one of my lectures because I just felt like I couldn't get out of bed. I've never had this lack of motivation ever and I keep getting upset wishing I'd never come to uni and I don't know what to do.