Dude, get your B12 levels checked. Was feeling old and tired, so I went to drs for something else, he ran bloods just to make sure. Came back ok except B12 deficient. Now I get a B12 jab every 12 weeks and top up with high dose B12 pills every day after 4 weeks. Tiredness gone, cold feet at night gone, visual migraines gone grumpy old git moods gone. Oh and fucking around in a good way is way more on the cards!