whht is your age madam?delay in the peiods for 4-5 days in pcos
is not a big problem.
As you have mentioned the foul smelling periods ,pls get the investigations done for type -2 diabetes
where pcos s will be prone for.
rule out infected genital tract ,for the same get the treatment.
Get your hormones examination done including thyroids,insulin
,HbA1c&PRL and visit the specialist for the same.