Encifer-O Tablet

My mother's heartbeat suddenly increases and she is also feeling some heaviness around her chest area. Actually, her hemoglobin was 6 around one month ago and doctor advised her 7 cycles of 300 mg iron injections (3 ENCIFER or OROFER S) in 200 ml normal saline. Since then, she has had five injection cycles in hospital. The last four iron injection cycles took around 2 to 2.5 hrs per cycle but fifth injection cycle was completed in approximately one hour by nurse. Also at the time of fifth injection, the canola was fixed on her wrist (since both the hands were paining as they were used for the last four cycles) and she was also told by nurse to hold the canola so that the same could not come out (but it was not the case in the last four cycles in which the canolas were fixed on hands i.e. On back side of palm). Since the application of fifth injection cycle, she was feeling heaviness in chest and now after 5 days of application of fifth injection cycle, she is saying that the heaviness has moved slightly above chest. The phenomenon of sudden increase in her pulse rate is also taking place. Today, I measure her BLOOD PRESSURE which was 135 and 62 and pulse was 98. She takes TELMIKIND40 for blood pressure daily and thyroid tablet of 75 mg daily for thyroid. Please explain, if the heaviness or sudden increase in pulse rate may be due to the fact that the fifth injection cycle was completed within one hour as compared to the last four injections (which took at least two hour each time) or is there something related to BLOOD PRESSURE which is causing heaviness and sudden increase of pulse or there may be different reasons for sudden increase in pulse and heaviness around chest area and about her present condition (can fifth iron injection given be harmful) and also what treatment should be given. I shall be extremely thankful to you.