I'll offer a bit of constructive criticism.
When I get down, it's because I am focusing on myself and not God. I'm being selfish and throwing a pity party. I can think up a million reasons not to happy and how things can be better for just about any situation if I let myself do so. But doing this is exactly what scripture says we should not do. Because this is not trusting in the Lord. Don't let the Devil get a foothold in that way. Self pity is one of his favorites.
It's really that simple in a lot of cases. I can quickly re-energize when I take the focus off myself and put the spotlight back on the Lord. This can include reading His word, or some other Christian authors, or prayer for other people (not myself) and their troubles. Another important one is service. Ask yourself how you are serving God and are you properly using your God given talents for His purposes.
This low time might be a trial and wake-up call to get your eyes back to Him.
You should be on top of the world. The God of this universe has chosen to have a relationship with YOU! He loved you first, as scripture says.
God Bless.