[Tolerance]

Alright, so I'm a mid level diamond Protoss having trouble with blue flame hellion drop.
Especially in the map Typhon Peaks, where Terran can drop in the bush and I cannot see it until its too late. gateway units are just too slow, everytime I killed all the hellions, I lose like 15 probes, sometimes when I just expanded blue hellion can come from multiple locations, with forcefield I really cant stop them once they get into my main, because they are so fast, and the amount of stalkers I have cannot kill them or outrun hellions. Anyone knows how to counter this?
I have already scouted it, just that I'm caught off guard in maps like Metalopolis, Tel'Darim, Typhon Peaks etc.
Even if I can stop hellion before they get to mineral line, terran always expand with bunkers set up and I cannot really do anything until I have enough units to counter all hellion drops or immortal to push through bunkers, im scared to take expansion in some maps because they have a wide range of space in front of natural for hellions to run around with like Xel'Naga and Slag Pits.
Even if I spilt up my probes, half my probes die and I will lose so much more. Any counter to this?
It happens at around 7 min mark usually when I'm expanding.