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The damp or moist weather can cause a couple of different issues for the Camellia.

Here is a link to help you determine which fungus and how to deal with it.
https://www.gardeningknowhow.com/ornamental/flowers/camellia/identifying-and-fixing-problems-with-camellias.htm

Yellowing leaves is an indication of plant stress, such as overwatering or pests. I would check the soil to make sure that it's not too moist. Also, check for any insect pests. For more information on what causes yellow leaves and to help pinpoint the cause in yours, this article will help: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

After seeing this severe image. I agree completely with you. I would start over.

I always say a loss in the garden makes for new opportunities. This is an excellent time to shop at local garden centers for new plantings.

Best of luck!

Did you fertilize the Camellias? Fertilizer burn can appear as scorched leaves.
I have listed a couple of links with more information on the common pest and fungus issues with Camellias.
If you don't feel it's a fertilizer issue, I would treat with Neem Oil. This acts as both a insecticide and fungicide.

https://www.gardeningknowhow.com/ornamental/flowers/camellia/identifying-and-fixing-problems-with-camellias.htm

http://www.caes.uga.edu/extension/thomas/anr/documents/Camellias_B813.pdf

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Excessive leaf drop like this can indicate too much fertilizer or a humidity issue. Back off on the fertilizer, especially if it's hot, and mist your plant with water daily to see if this helps.

You can normally cut them back by a third without harming them. This article should help: https://www.gardeningknowhow.com/ornamental/flowers/camellia/pruning-camellias-how-to-prune-a-camellia-plant.htm