Will i be able to have another baby with lupus, sjgren's syndrom, intestrnial cystitis , sponge kidneys and irregular heart beat?will it make it worse?

Impossible to answer: This question needs to be addressed with the doctors who care for you. There is no possible way a doctor on the internet without a complete history and test results can even begin to offer an opinion.

Diffucult situation: Many of your conditions make pregnancy difficult especially since a pregnancy may make the diseases worse specifically lupus may worsen significantly with pregnancy and with sponge, kidney disease a pregnancy may worsen the disease and cause significant hypertension that could compromise your health and the health of your fetus seek consultations with your rheumatologist and a high risk obstetric.