front end clatter

I have a marin sausalito hybrid, been riding it on mixed terrain for 2 years, it sings, lovely bike. Till I took it to our local bike shop man and asked if he could help me out with the seating position which has never really been comfortable. Now a riser and a new headset, endless new brake cables and 2 new slicks for some road events coming up, I now have a clatter in the front end that was never there before and it's driving me crazy. Bike shop man deoesn't seem to care and won't help me to get to the root of it. I hear it clearly but just can't figure out where it's coming from and it's ruining my enjoyment. Also getting a random click/creak in the pedal area that was never there before. Any advice? By the way, even before I put new high pressure tyres on, it never rattled when on uneven ground. Not until now