Apart from all the good advice, hobbies, voluntary work, Gardening, getting a cat or dog - you need to find your ikigai pronounced ichigai [japanese term loosely translated as being a reason for living], if you think that might be voluntary work - check out if there are any homeless shelters, or childrens' homes etc they will bite your hand off. You also need treats and things to look forward to, think back to when you were a child and how much you looked forward to Halloween, Christmas and holidays etc..the only difference being that when you are older you mainly need to book or arrange things for yourself - We are from generations who felt guilty about putting ourselves first but you have to get past that. If you don't have a lot of money then book accordingly but you should have things to look forward to and remember most of the time no one else is going to arrange it for you or if they do it won't necessarily be exactly what you want, plus you won't have to hang around waiting for something to happen. Book a trip away somewhere different.
A good book can take you into a different world and can be downloaded for free or 99p on kindle.
Don't let the dark thoughts hang around like a black cloud, let them rain for a while if you must or need to sort through something and then let them pass.. [examine your thoughts, rage, write down your feelings and then let them go. Everyone gets them sometime or other, practice letting bad energy go and it will become second nature after a while. Don't dwell -especially on the news as it would drive a saint mad at the moment and if you're by yourself you won't have anyone to vent to or about it. Remember we only live one day at a time so worrying about the future is pointless especially as when the time comes you will be living through it on a day to day basis anyway. One day at a time. Join a bookclub or theatre group - even just to help with sewing the costumes if you don't fancy getting up on stage. Ask at your local schools if they want anyone to help out with cookery classes etc etc... you need to get out and do something. Have a good cry [your tears carry away toxins and negativity] and you will feel tired but refreshed and renewed.
All the best - sending good thoughts your way.
My ikigai is dogs and grandchildren - not in that order....
plus gardening, cooking, reading, crochet, sewing and painting.. plus.dreaming about the trips I will take when I get a bit of money......I really want to visit the Alcazhar in Spain, plus would love to see the Northern lights and maybe Florence one day...like I said we all need things to look forward to.