It has nothing to do with vaccination.  All happened because of bike riding.Pls do hot fermentation and do extension exercise also know as bhujangasana 5 times twice a day.

Apply Hot Fomentation twice daily. Avoid bending in front. Postural Correction- Sit Tall, Walk Tall. Extension Exercises x 15 times x twice daily - lying on tummy, take left arm up for 3 seconds, then bring it down, right arm up for 3 seconds, bring down. Bring right leg up, hold for 3 seconds, bring it down. Then right leg up and hold for 3 seconds and bring it down. Repeat twice a day- 10 times

Bike ride a reason start physiotherapy treatment and stretching exercise 

Cause of back pain can be because of multiple reasons. Information provided by you is not sufficient for exact diagnosis. Check out this video for better understanding of cause of pain.

1.Soft tissue massage, muscular and trigger point releases 2.Light thoracic spinal mobilisations for pain relief 3.Firm thoracic spinal mobilisations for stiffness 4.Modalities such as heat, ice and TENs Protection such as compression, padding, strapping 5.Support braces or tape assisted posture retraining 6.Muscular stretches 7.Range of motion and breathing exercises 8.Postural training for core and alignment 9.Muscular strength and endurance exercises Dry needling 10.Manual handling, ergonomics, technique training,

Not Related To Vaccine. Back Pain May Get Aggravated When Back Muscle Are Weak & You Use It Over The Strength. You Can Apply Hot Pack & Do Some Stretching Exercises for it. If You Want You Can Take Proper Exercises Program For Back Problems, To Avoid Further Increase in Future.

It is due to same posture for prolong period of time, because of this back muscles are overused and get tight. Apply hot formentation,and take muscle relaxant also.

It could be due to back muscles strain. You should give hot water fomentation for 15-20 minutes twice a day for three days. You can use volini gel or spray provided you are not allergic. Avoid prolonged sitting. Avoid lifting heavy objects. Turn to one side while getting up and lying down. Once the pain subsides, you should do back stretching and strengthening exercises with proper guidance.

Yes due to prolonged sitting in improper posture causing pain, dont worry take Myospaz tablet twice a day and apply ice pack/hot pack twice a day. Maintain proper posture, rest untill pain reduces then can start with routine exercises.

It might be due to paraspinal muscle tightness or due to inner border of scapula muscle tightness Due to prolonged activity Try to apply heat pack and Do wall pushups It will help you It is not atal related post vaccination

You need an assessment before treatment. You could attend Physiowise Orthopaedics and Sports Physiotherapy, HRBR layout 1st block.