Consult physiotherapist to take ultrasound treatment, stretching of plantar fascia. Apply ice cube massage on painful area 3-4 times a day. Use silicon heel pad inserts in your shoes.
Since you are having heel pain since many years, get your foot examined by orthopaedician or physiotherapist to check for foot alignment, tightness in calf musles.
After pain subsides, learn strengthening of foot muscles from physiotherapist. This will prevent recurrence of heel pain in future.
Next Steps
To reduce morning pain, stretch the calf musles before you start walking. You can do this stretching by pulling your foot towards you using a towel wound around your foot.
Health Tips
Use footwear with soft insole. Avoid prolonged standing or walking till pain gets relieved.