Thank you for waiting and I understand the situation is very scary:
HEre are the studies regarding your risk:
The most widely cited study of per-act anal-transmission risk was published in 1999. It found that amongst men in high-income countries, unprotected anal intercourse with an HIV-positive insertive partner carried an estimated 0.82% risk of infection for the receptive partner per sexual act, or a 1-in-122 risk of transmission.5 It estimated the risk for the insertive partner as 0.06% per sexual act, or a 1-in-1666 risk of transmission.5
A more recent study amongst men from Sydney, Australia,6 has been able to more accurately estimate the per-act risks based on a wider variety of factors. The data support a recent meta-analysis of all previous studies of the per-act risk of receptive anal intercourse to ejaculation for both heterosexuals and sex between men, which was estimated to be 1.4%.7 Table 5.2 below, provides an overview of the Australian study's estimates.
Risk of HIV transmission via anal intercourse, per sexual act
Insertive partner's risk (circumcised)
(1 in 909)
Insertive partner's risk (uncircumcised)
(1 in 161)
Receptive partner's risk (without ejaculation)
(1 in 154)
Receptive partner's risk (with ejaculation)
(1 in 70)
Source: Jin F et al. Per-contact probability of HIV transmission in homosexual men in Sydney in the era of HAART. AIDS, published online ahead of print, 2010.