Thanks for your query.
There is a high possibility to have bed bugs and many a times bite marks are not visualised. I ask you to wash all of your bed linens in boiled water along with your clothings. Then use those washed clothings and bed linens. If its due to bed bug then it will be releived. Otherwise as your husband are denying any such symptoms which you are suffering this may also be a case of tactile hallucination
and in that case you have to consult a psychiatrist
and have a trial of anti-psychotics and look for the improvement.
Hope i have answered you.