Hi,
More details required to recommend specifically. The reason behind Irregularity of period need to know. You should follow a balanced diet rich in goo quality protein like egg, dahi/ yoghurt, paneer, soyabean, almond, cashew, sprouts etc and fresh fruits and vegetables. Try to follow a proper meal timings. Please don't skip breakfast and do some exercises.
Next Steps
You can chat directly with me on practo with all require details.
Health Tips
Don't take stress or anxiety which can lead to negetive effect on health.