Tiredness is getting the upper hand over any attempt to optimism. There is no more margin for negotiation, so get some rest. Everything is in your mind, so look for some relief from worrying or obsessive thinking, make a pause between thoughts. Retreat in solitude as much as your daily tasks allow you to do, seek some silence. A couple of days is enough time all by yourself, then seek some company. Spend some time with those friends or relatives who don't judge you, look for people who know who you are. They can cope with your ups and downs. From then on things will get better and a lighter note will enter your mood. Activities carried out in a group will be highly beneficial.
Despite this wave of weariness some signals will suggest some positive development in your circumstances. This is to say that it's you, not life. Life in itself is offering you - or is about to offer - opportunities and some exciting news. So give first full expression to all your exhaustion, recover and then look at things with renewed optimism.