Hi, welcome to healthcare magic
The vaginal itching
may indicate an infection, reaction to chemical agents (the detergent that you use, any creams/ointments,femnine sprays,fabric softener,toilet paper), stress may increase vaginal itching.
Scratching would result in burning on urination.
You can use over the counter vaginal medications to treat any yeast infection.In terms of other treatments- eat yogurt, avoid using colored or perfumed toilet tissue or bubble bath,avoid feminine sprays and douches, wear cotton underwear and avoid synthetic material, lose weight if overweight
., use milder soaps and detergents.
Irregular or light periods have many causes such as- emotional or physical stress, inadequate nutrition, excessive physical activity, abnormal levels of hormones such as thyroid hormone, prolactin
, a condition called PCOS which stands for polycysitic ovarian syndrome can also cause irregular periods
You should consider consulting you doctor for a full assessment to find out the exact cause.
I hope this helps