Suspicious vehicle

For the last few weeks I have been convinced I've been followed I've seen the same guy in shops and at the end of my street I've noticed two different cars parked with someone on their phone , one of which is in his 40s dressed in office wear and I'm 98 % sure it's the same guy I see in the shops they have no reason to be down my culdesac and they weren't obviously not visiting anyone , I've mentioned it to my carer and it's hard when u suffer with paranoia to distinguish . Anyway I have an over night carer most days that hb are aware of as I get a room allowance for this , well she has come round and said they was a man dressed in office wear walking out side her house and then went round the back her Josue is detached and he was taking pictures she then followed him away and took a pic of the car he proceeded to get in and then got on his mobile phone .... it's one of the cars that keeps parking at the end of my street and in the pictures she took its the same guy I keep seeing in shops etc , I'm worried , my head feels like it's going to explode and I'm scared to go anywhere what can I do ?

Hi yes we have the registration number , would they be investigating my carer if they don't claim any benefits ? I'm sorry if I sound stupid but what would contacting welfare advise do ? Can they find out anything ? And what would I say to them ?

Ok thank you can I ask ? What would u say to a welfare advisor without looking stupid and paranoid ?