I understand how you feel. It is really not easy and not healthy to be in a long distance relationship with our spouse once we are married. A family that lives together, stays together.
How long have you been apart? May is really just 4 months to go. Hang on there. Before you know it, it will be May already and you will be happily reunited.
Do let your hubby know how you feel: your worries, insecurities, frustrations, etc. Ask him to take positive steps to give you more assurance of his whereabouts and activities. Does he have colleagues there whom you know you can contact in case he is not contactable?
Meanwhile, keep yourself busy, happy and occupied with your work, family and friends. When I was in a long distance relationship, I kept myself very busy with work, family and friends and in voluntary work tht I didn't have time to miss anyone. If it helps, talk to another close friend about this. Take care.