In total 389 Britons have suffered blood clotting disorders after receiving the AstraZeneca vaccine, of which 68 died. The NHS has deployed 45million doses of the British-made jab.
Under-40s are being given alternatives to AstraZeneca's vaccine because the conditions seem to be affecting younger people more often.
Speaking about Lucy's experience, Mr Tomlin said: 'She knew there might be some side effects but she wasn't worried. We thought they would just clear up as most people's do.
'That reassured her and she didn't think it was anything to do with the vaccine but things just started to get worse and the panic began.
'She developed a bruise about the size of a tennis ball on her. Normally she had all the energy in the world but she became tired and lethargic.
'Then she got a really bad rash on her face and side. Her gums started to change colour and we got really worried.'
On April 1 - 13 days after her vaccination - Lucy was rushed to the Leicester Royal Infirmary where blood clots were diagnosed.