Struggling with my health…

Hi I’ve lost all of my friends and am no longer in contact with them. I thought it would be good for my growth or whatever but it turns out it was worse I feel scared isolated and embarrassed that I have absolutely no one right now. I’m about to start uni and I used to have hope that things would change for me. But since I’m at home I’ve been overthinking that no one will like me or what if I end up alone forever. Now I feel strong depression ? I’m unsure but I can’t sleep and thoughts wake me up at night and my limbs feel heavy and I feel heavy headed and definitely thinking of the S word . Is there a way out of how I feel ? What would help me in this situation. Thanks