I'd suggest you need another physio's opinion. One might ask if you feel that the calf is directly linked to the hip pain. Does the calf pain come one after the hip pain? Could it be that the calf causes pain when the hip is OK? Do you feel the calf issue is secondary as you try to walk in an altered manner due to the hip pain? All these are important questions to ask yourself and to provide the answers to a therapist.

It may well be your issue is in the hip joint, though at age 20 this is perhaps less likely. It may be a referral from the nerves somewhere between the low back and the leg. As this is not often inflammatory, it won't necessarily show up on the scans you've had. It is more likely a mechanical issue (i.e. pressure on something that should be taking pressure). As a woman there are also various female anatomical issues that can lead to referred hip pain etc (e.g. ovaries).

I would say that your first physio has done a good job in trying an approach but only for a short time as it did not work. We can use that information to continue to investigate other areas. It is most unusual for someone of your age to continue to have such an issue.

Also are you a sporting type? Are there other factors that we should know about that have lead to this issue in the first place?