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They are not so good for a wind block. While some people refer to them as having "vines", they actually have canes. It won't climb a fence and intertwine with it.

This article will help you determine if the plant is still alive or not: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

Birds love berries. You can use netting. Some people also like to use old CDs (the shiny reflection scares them) or predator decoys, like inflatable owls and the like. This article may help as well: https://www.gardeningknowhow.com/edible/fruits/fegen/protect-fruit-tree-birds.htm

This article will help you with this:
https://www.gardeningknowhow.com/edible/fruits/raspberry/white-drupelet-syndrome.htm

While you could try upping the nitrogen some, it's likely the heat that is affecting your plants. The high heat, which many parts of the country are expeiencing right now, can quickly stress out a plant--even with daily watering. Temperatures slightly over 85 F are bad enough but when you factor in triple digits, as most are experiencing, these extreme temps cause water to evaporate before reaching the plant roots. To help alleviate this, make sure to allow the water to soak in the ground (at least 20-30 min) by using a soaker hose or drip irrigation and avoid overhead watering. If feasible, shade cloths can help during the hottest part of the day.

It sounds like you may have Anthracnose. This article will have more information:
http://www.fruit.cornell.edu/berry/ipm/ipmpdfs/BB%20anthracnose%20fast%20fact.pdf