That is awful that she put you in an orphanage.

In my opinion, I think that something abusive happened to you before or close to 8 years old, and this could be repressed out of memory. And, your mother's rejection - putting you in the orphanage - possibly fixated you to this obsessional phase and the later phobias.

Contamination is the current theme. So, I'm wondering who contaminated you to begin with. I'm using contamination in the sense that you were abused by someone. Your phobia sounds like a desperate urge to get rid of something that contaminated or abused you long ago, even though you've lost awareness of what this is.