I'm not a PM so I can't say that work wise I understand what pressure you might be under but I do work at a startup, I've felt the pressure of work and having to deal with multiple stakeholders and I am unmarried and deal with loneliness quite often. At one point I was working 10-12 hours a day which led to a point where I was so burnt out that I could hardly function. I finally started therapy then and it's been an absolute game changer. The things I've unearthed about myself and the work I've done in therapy and improved my relationship with work and people around me. I feel much more content with myself and I'm able to draw healthy boundaries. I'm able to say no at work without the fear of sounding like a bad employee. In addition to this I do the following things to keep my mental health in check :
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Constantly in touch with family. Even a phone call with them is a sweet reminder of the fact that I have people who care and would show up for me at the drop of a hat.
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Excercise. Hate it, curse it, do it. Endorphins can really change your headspace.
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Have a good circle of friends. I call them up when I'm sad and lonely tell them how I'm feeling. I let them help me. I stay over at their place for a day or two sometimes.
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Do things I find peace in - walks, cooking, reading.
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No work before 9 am and after 7 pm. My manager knows this and I only work outside of this timeline if it's a code red situation.
The hard reality is only you're responsible for your happiness. Between choosing better (boundaries, friends, lifestyle) and getting help (therapy) you'll be okay.