Hi, I bought a memory foam matress from a seller on ebay his feedback was good so I thought ok it must be alright? we have had it for over 2 weeks now and it is lying on top of the spare bed ,with the windows open, when we first opened it the chemical smell made my eyes water, it is still nealy as bad now, we havn't been able to use it yet, i wrote to the seller twice but have not had an answer yet , I think it will have to go back?