How do I stop my body from overreacting?

Hi doctor,

Recently I went through a long period of chronic stress and anxiety. Since then, I have not felt well and have been bedbound, mainly with severe fatigue. I have noticed some strange symptoms and wondered if you could tell me if it is a mental health condition, please?

If I am watching television and something slightly emotional comes on, I suddenly feel strong tingling. I will also cry at the slightest thing. I have to stay calm all day. No stress or anything exciting. My heart starts beating fast if I experience even the slightest bit of excitement or stress. If it is before bed, I will not sleep all night. It makes me feel lightheaded and very unwell straight away. Even just having a normal phone call before bed will do this. Any stimulation sets me off and causes me to feel unwell. I cannot handle the slightest bit of stress or even make a simple decision. Then, suddenly, I get head pressure, making me feel unwell. Even something that before I would not find stressful at all. If I hear a sudden loud noise, it will make me jump, and it starts paining my body. It is like my body is overreacting to everything and making me feel unwell to the point I am bedbound.

Have you heard of this before? Is it a normal health condition? Please help.