Concor Cor 2. 5. Irrespective of time?

My doctor prescribed me Concor Cor 2.5 as I have arithmia prblm.. after having 2 months I have stopped dat for last 20 days... I didn't face any problem . But today evening I had 2 boil egg and had mutton 2 pc liver and 2 pc fat mutton pc. Daily I walk for 10-12 kms at evening with avg speed of 5km/hour. One year back I have gone through angiography where it was found - "Angina, Minor CAD + Minor plaque build at MID" . My cardiologist who did angiography he told me my heart is absolutely fine and he only prescribed me telma 20 + Roseday 10 and suggested me to loose weight as I was 108 kgs dat time ...I stopped dose medicine after 6 months as I lost 24 kgs and lipid profile normal till now and normal pressure. Today m feeling short of breath and high pulse avg 100 when m lying on bed for 3 hrs. Concor Cor 2.5 suggested only one tab at 10am..after taking dat I found my BP falls to 60/100.dats why stopped after 2 months.. Can I take dis only when I feel high pulse irrespective of time ?