I can't eat dairy or yeast either. I found a great dairy free yogurt that I love. As for the fatigue, I also have fibromyalgia and I found this great doctor on endfatigue.com. He has an energy revitalization powder mix that has every vitamin you can imagine in it. One of the main problems for people with food allergies/sensitivities is we don't get the nutrients we need. This mix covers that problem. Good luck

Sourdough bread does not use yeast do give that a try. You can get it in most supermarkets now. If it is the proteins in the milk rather than just lactose, you may find you still react to soy milk. I also react to almond milk. Oat milk works well for me and coconut milk is good for cooking although I don't like the taste for hot drinks. Violife soft cheese works well as a cooking ingredient. I have used the Oatly brand for yoghurt and milk and custard. The doorstep milk deliverers in UK also have a brand Oato however, I just discovered Overherd a dried oat milk powder you can make up in small amounts and refridgerate and also use directly in hot drinks and cooking. Takes up less space and has no additional oils.

I am so sorry. Have you tried Googling non-dairy and/or non-wheat recipes? If you can afford it, or insurance pay for it, maybe a nutritionist could help.

It sounds like you need to take a Calcium supplement if you can no longer eat dairy.

There are a lot of great alternatives to dairy and yeast - I would check out the 'free from' section of the grocery store or in the health food area for yeast free options.
Here is a great place to start looking for recipes: http://www.godairyfree.org

Sometimes when you go through eliminating things from your diet it takes our body a while to adjust and that is why you have the fatigue. There are so many milk alternatives. I use Almond or coconut or a combination. I have tried hemp, cashew and some of the others and prefer to use those for cooking only. There is also vegan cheeses and yogurts. Whole Foods carries a coconut milk yogurt.

If you are worried about not getting the nutrients that you need you may want to consult with a specialist who can work with you and suggest ways to enhance your diet. Although I am pretty well educated in this area I worked for months with one to make sure that I was not depleting my body of things that it needed.

Good luck!