I need advice

I’m having a really hard time and I needed some advice. For the past couple of years I’ve noticed I have a problem. I get drastic mood swings, at first I assumed it was hormonal and normal but the problem seems to have increased to a bigger problem , I’ll be happy one second then all of a sudden I’ll be overwhelmed with anxiety or a feeling of emptiness. This can happen any time I could be out with friends then suddenly my mood will drift into a dark place. I feel emptiness , I feel alone and I feel really bad about myself and I sometimes question the point of living and getting up in the morning. I can be a really positive person at times but when my mood decides to change it’s drastic , I don’t want to participate in any social activities , I don’t wanna go outside even. I completely isolate myself from the outside world and I feel so alone and worthless and If its a bad day I contemplate suicide. I just wanted some advice on what to do? I don’t wanna go to family or my partner as I worry they’ll feel guilty. Do I need to see a doctor or seek professional help ?