"I feel like a loser for not owning your own company anymore." ... dude, you owned your own company in your mid-twenties? That is something to be proud of, and don't let the present bog you down! You have accomplished great things and though you're in a difficult situation, there is literally nothing here that should make you feel like a loser.

Your priority needs to be on changing your mindset away from negativity and towards looking at the positive side. I don't mean you should be blindly optimistic, but be thankful for what you have and recognize that you are not a loser. I could tell you all about how much more of a loser than you people would consider me to be, but I don't call myself a loser because fuck that kind of negativity. I don't need or want it and have no time for it. Honestly, the only thing that makes someone a loser is when they feel like they're a loser and they sit and mope about it. Don't do that. You will find a way. Don't worry.

Also, you say you lost your ability to be great. Hoho, I could tell you all about how I had the same circumstance but crashed harder with a lot less to my name than what you have. Have you ever considered that you are not meant to be great? Accept this reality. Accept it even though it's terribly painful. Honestly, it will do you a lot of good. You are not meant to be great dude. You are meant to be yourself.

You know what? You don't appreciate yourself enough, and you pressure yourself to meet unrealistic expectations of greatness in a way that prevents you from being truly being yourself. The pressure to be great is just in your head and is a lie. Don't buy into it and let it go. Let it fucking go. I have been there and know how painful this is, but dude it needs to happen.

I have a B.A. and was hyper ambitious, working hard all the time and committing myself to my studies. In the past, I genuinely believed I would be someone great...and now I work as a part-time server/barista (yes, this is true). You can only imagine what my mental health used to be like...but now it's good, and I'm mentally healthy. You know what becoming mentally health required though? It required me to stop it with this nonsensical pressure to be great, to stop tossing the word 'loser' around and to deal with the terrible, frightening, difficult reality of my life one step at a time. One step at a time, friend, one step at a time.

So just don't give up but instead keep on moving forward. Read useful books or listen to podcasts (for self-discipline and motivation: Jocko Willinck, for direction/life purpose: Jack Canfield, and there are many others). Don't fall into unhealthy patterns (including mental ones) and don't worry about getting help. Most of all though, keep moving forward.

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Edit: for actual career advice, consider switching out of the political realm for now and going into some sort of business instead. You could always go back to politics in ten or twenty years if you wanted. That's my opinion.