How interesting! I am a synesthete myself.
Quote:
The word synesthesia comes from two Greek words, syn (together) and aisthesis (perception). Therefore, synesthesia literally means "joined perception."   Synesthesia can involve any of the senses.
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Here's a good link for more basics. I don't know of any particular link to OCD though, sorry.
http://faculty.washington.edu/chudler/syne.html
Be well.