Anxious about returning to work

Il try keep this short. My lo is 5months old and im a single mum. He doesnt usually stay away for me much because i just feel so anxious being away from him. I know hes safe and happy with the people hes away with but hes only ever had 2 over night stays and a couple of days were hes been away for a few hours and i feel so lost and anxious to just get him back. Im due to go back to work in june and the thought of its making me physically sick and i just end up crying. Iv gt a new job who is going to toally work around me so it will be 6 hours 3 days a week. Its having to leave him with a childminder for those hours. I just cant help but feel so bad having to leave him with a stranger who he doesnt know. Its making me really dreading starting back. Family having him while i work isnt an option as they also work. Has any one ever felt like this before, how do i get over this feeling. Any advice would be great