Hi Hun, i posted the same thing here a about 3 months back Noah went through the same thing at 7months- 9months. Every-time i left the room he would scream, he wouldn't go to no one.
From 10 months wen i started going back to work, him walking and becoming more independent also having to have him looked after. He has know completely changed, would go to all the family even family friends he barely knows.
It is diffo a phase hun, i think they say they either go through it at 7-9months or between 18-24 months.
Char