One step at a time. Don't overwhelm yourself by mentally cycling through the cacophony of problems in your life and making yourself feel hopelessly helpless. Firstly, tackle the short-term issues over which you can exert your full control, namely your weight AND simultaneously introduce a gentle routine of centring yourself either through a light routine of prayer or meditation. The weight gain is an unnecessary burden you've placed on yourself albeit one that is quite easy to succumb to when we're wallowing in the blues.
Increase your water intake; construct a daily routine that isn't unfeasible to adhere to at first, and generally be positive. Nothing or nobody is going to take away your pain on your behalf. There is no magic spell that will heal you overnight. But through the accumulation of concerted positive acts over the course of weeks and months, the darkness will begin to subside.
Honestly, get rid of the weight, bro. It's totally nonsensical to labour under such an unnecessary physical and mental burden. Once you've eliminated that particular issue, then you can focus on the deeper long-term problems. By then you'll have developed at least a vague sense of satisfaction and pride at having instigated and overcome one moderately major issue that was getting you down. Make the most of the remaining warm weather and sweat out your "demons!"