Using of volini spray / gel wouldn’t cause much problem when compared to taken as a tablet If it is a muscle catch the pain will subside in a few days and this will help you. But if they are like cramps which come once in a while the most common reason for that is likely to be 1) exercise - so proper stretching is required 2) deficiency of calcium, potassium

No there is no harm applying volini spray but you can use other methods too like hot water bag application and Stretching Also using such a number pain killer is never good so try to avoid that and if you are feeling some difficulty consult some physician and go through a proper channel not like taking random medicine anytime

Too much of nsaids will cause kidney problems. Pain killers used in spray has relatively less blood circulation. But still it not advised to use this much pain killers at your age unless the problem is very severe. If you are facing frequent muscle spasm check for any nutritional / mineral / vitamin deficiency.