Latest update....thanks to everyone for your helpful and supportive replies. I did write a heartfelt thank you note and left it in their trays at work....I haven't had any response as yet as I had to attend a course today and they are off to an O/s conference. Hopefully they will understand my request and my intentions....I still want my job but not at the expense of my health.....I'll keep you all posted.
Thanks for everyone's support