Nic

It is the prerogative of any country to turn you away.
None more so than drugs related. (USA included)

If you have a drugs conviction registered against you, your travelling days to Philippines may well be over.
Even minor UK offences connected with marijuana
If this is the case there is no way any lawyer can help.
In the event the lawyer would be discovered, the penalty is very severe.

No pre-judgement or offence intended
Just trying to help