Does any one know where I can find Hypoallergenic bedding such as sheets, blankets, pillows. I have bad asthma and wondering if I can find it in Chiangmai or order it online if so link would be great!

100% cotton? I've found what Thai claim to be one thing is not the same as what it is called in your home country.
Try the big stores like homepro or the one at airport plaza but check the label carefully.

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Try Index Living Mall on the Super Highway

You can use a full size flat sheet as a bottom sheet on a queen, just knot the corners.  Much easier to wash.  Blends suck, and mixing with bad laundry detergent makes it worse.  I bring all my cotton products from the States...sheets are way high up on the list of stuff to bring from abroad.  You can order from Amazon...$$$$.

Every two years I make a trip to the big Central Chidlom dept store in Bangkok specifically to buy sheets and towels.  Spend a small fortune for quality stuff.  I've seriously thought that a trip back to the U.S. with empty suitcases to visit Bed, Bath & Beyond might be more cost effective.  This is the flagship store of the Central dept store chain and they have a bedding dept that's bigger than the entire Central store at KSK mall.  Even have a good selection of high quality flat sheets -- almost impossible to find in most places that selling bedding here.

 

Yes, I know you can buy quality bedding on-line, but this is something I just have to see and touch before buying.

 

 

I'm no expert... but I find the bedding from IKEA Bangkok to be of great quality. Lot's to choose from including hypoallergenic duvets and pillows. Same prices as back home.